$\frac{m}{\frac{m^2}{s^2}}$
$6x+1+7x$
$81x^2+16x-72=0$
$3x-1<x-11$
$5\frac{dy}{dx}=e^{2x-3y}$
$12z^2\:-\:16z\:+\:4$
$3x^4-9y^3$
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